Description of Business and Summary of Significant Accounting Policies- Cash, Receivables, and Inventory (Details)	12 Months Ended
Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
Restricted Cash
Maximum number of days cash remains restricted pursuant to like-kind exchange agreements	180 days	180 days	180 days
Accounts Receivable
Number of days in which accounts receivable are ordinarily due	30 days
Number of days in which contract retentions are due	30 days
Minimum number of days past due for accounts receivable to be considered delinquent	120 days
Merchandise Inventories
Percentage of inventories valued at the lower of cost or market using LIFO retail inventory method	95.00%

Represents the minimum number of days past due for construction accounts receivable to be considered delinquent.

No definition available.

Name:	dds_AccountsReceivableConsideredDelinquentNumberOfDaysPastDueMinimum
Namespace Prefix:	dds_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of days in which construction accounts receivable are normally due after the issuance of the invoice.

No definition available.

Name:	dds_AccountsReceivableDueDays
Namespace Prefix:	dds_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of days in which construction contract retentions are normally due after completion of the project and acceptance by the owner.

No definition available.

Name:	dds_ContractRetentionsDueDays
Namespace Prefix:	dds_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The maximum number of days cash remains restricted pursuant to like-kind exchange agreements.

No definition available.

Name:	dds_LikeKindExchangeAgreementMaximumDaysCashRemainsRestricted
Namespace Prefix:	dds_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of inventories valued at the lower of cost or market using the last-in, first-out retail inventory method.

No definition available.

Name:	dds_PercentageofLIFOretailmethodinventory
Namespace Prefix:	dds_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

No definition available.

Name:	us-gaap_AccountsReceivableNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	us-gaap_InventoryGrossAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	us-gaap_RestrictedCashAndCashEquivalentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration